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Miller" , "Eric Dumazet" , "Paolo Abeni" , "Simon Horman" , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , "David Ahern" , "Jay Vosburgh" , "Andrew Lunn" , "Hangbin Liu" , , , To: "Fernando Fernandez Mancera" , "Jakub Kicinski" From: =?utf-8?b?UmljYXJkbyBCLiBNYXJsacOocmU=?= X-Mailer: aerc 0.21.0-120-g0a16d1784be2 References: <20260305-net-nd_tbl_fixes-v3-0-fde28b30a744@suse.com> <20260305-net-nd_tbl_fixes-v3-2-fde28b30a744@suse.com> <20260305182521.0ca7313c@kernel.org> <20260306183914.4b13a03d@kernel.org> <691d5589-46ea-4947-9510-bfd9d991ed02@suse.de> In-Reply-To: <691d5589-46ea-4947-9510-bfd9d991ed02@suse.de> On Sat Mar 7, 2026 at 4:27 AM -03, Fernando Fernandez Mancera wrote: > On 3/7/26 3:39 AM, Jakub Kicinski wrote: >> On Fri, 6 Mar 2026 10:58:44 +0100 Fernando Fernandez Mancera wrote: >>>>> + if (unlikely(!ipv6_stub->nd_tbl)) >>>>> + goto out_drop; >>>> >>>> So neither Fernando nor you checked whether this code can be built >>>> as a module? ipv6_mod_enabled() should work just fine >>> >>> I checked it. If IPV6=3Dm this is not fine. >>> >>> ld: vmlinux.o: in function `bpf_out_neigh_v6': >>> filter.c:(.text+0x3231d60): undefined reference to `ipv6_mod_enabled' >>=20 >> Guess I got it backwards :/ Should we add this to the series? >>=20 Nice, thank you! > > No worries. > >> -->8-------- >> Subject: ipv6: move the disable_ipv6_mod knob to core code >>=20 >> Make sure disable_ipv6_mod itself is not part of the IPv6 module, >> in case core code wants to refer to it. We will remove support >> for IPv6=3Dm soon, this change helps make fixes we commit before >> that less messy. >>=20 >> Signed-off-by: Jakub Kicinski >> --- > > Ricardo could you add it and check if it is fine? FWIW; I am sending=20 > today the series removing IPV6=3Dm after some testing to net-next tree. Will do! > > Thanks, > Fernando. > >> include/linux/ipv6.h | 7 ++++++- >> net/ipv4/af_inet.c | 6 ++++++ >> net/ipv6/af_inet6.c | 8 -------- >> 3 files changed, 12 insertions(+), 9 deletions(-) >>=20 >> diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h >> index 443053a76dcf..e5b6853d517a 100644 >> --- a/include/linux/ipv6.h >> +++ b/include/linux/ipv6.h >> @@ -333,7 +333,12 @@ struct tcp6_timewait_sock { >> }; >> =20 >> #if IS_ENABLED(CONFIG_IPV6) >> -bool ipv6_mod_enabled(void); >> +extern int disable_ipv6_mod; >> + >> +static inline bool ipv6_mod_enabled(void) >> +{ >> + return disable_ipv6_mod =3D=3D 0; >> +} >> =20 >> static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) >> { >> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c >> index babcd75a08e2..f1944e8fd9d3 100644 >> --- a/net/ipv4/af_inet.c >> +++ b/net/ipv4/af_inet.c >> @@ -124,6 +124,12 @@ >> =20 >> #include >> =20 >> +/* Keep the definition of IPv6 disable here for now, to avoid annoying = linker >> + * issues in case IPv6=3Dm >> + */ >> +int disable_ipv6_mod; >> +EXPORT_SYMBOL(disable_ipv6_mod); >> + >> /* The inetsw table contains everything that inet_create needs to >> * build a new socket. >> */ >> diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c >> index 0b995a961359..03c175cbbdb6 100644 >> --- a/net/ipv6/af_inet6.c >> +++ b/net/ipv6/af_inet6.c >> @@ -86,8 +86,6 @@ struct ipv6_params ipv6_defaults =3D { >> .autoconf =3D 1, >> }; >> =20 >> -static int disable_ipv6_mod; >> - >> module_param_named(disable, disable_ipv6_mod, int, 0444); >> MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-fun= ctional"); >> =20 >> @@ -97,12 +95,6 @@ MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all i= nterfaces"); >> module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); >> MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on a= ll interfaces"); >> =20 >> -bool ipv6_mod_enabled(void) >> -{ >> - return disable_ipv6_mod =3D=3D 0; >> -} >> -EXPORT_SYMBOL_GPL(ipv6_mod_enabled); >> - >> static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) >> { >> const int offset =3D sk->sk_prot->ipv6_pinfo_offset;